Calk for golf shoe



Nov. 8, 1955 F. c. PHILLIPS CALK FOR com" SHOE Filed Feb. 8, 1954 UnitedStates Patent CALK FOR GOLF SHOE Fred C. Phillips, Stoughton, Mass.

Application February 8, 1954, Serial No. 408,750

2 Claims. (Cl. 36-59) This invention relates to an improved two-piececalk for golf shoes. A somewhat similar calk is described and claimed inmy Patent No. 2,578,591, granted December 11, 1951, and has proved to besatisfactory in use and a successful article of commerce. An object ofthe present invention is to provide an improved calk which is morerugged and can be manufactured with more uniformity of quality. Thepatented calk comprises a disc of soft steel pressed or driven onto ahardened steel spike member. The latter has a short serrated portionterminating at a shoulder formed by a radial flange. The disc is pressedon the serrated portion until it reaches the shoulder. If correctlyassembled the result is an excellent calk although it can come apart inthe unusual event of a strong force being brought to bear on the disc ina direction opposite to that of the force applied thereto in assemblingthe parts, a circumstance which can happen but rarely when the calk isin use on a shoe. For a good bond between the disc and spike member, theserrations must be clean and sharp. Since the serrations end at ashoulder uniform cleanness of the serrations is not easy to attain whenthe calk is being manufactured in large quantities.

The improved calk is a two-piece structure with all the advantagesinherent in a structure of that kind. In addition, the assembled partsare firmly locked against separation regardless of the direction of theforce applied. Moreover the spike or stem part is more readily madesince the grooves of the serrated portion are open at both ends insteadof having one end at a shoulder. Since the flange of the earlier form iseliminated, the serrated portion can be made with a greater diameter andtherefore with a greater circumference, thus increasing the strength ofthe lock.

For a more complete understanding of the invention reference may be hadto the following description thereof, and to the drawing, of which-Figure 1 is a perspective view of the disc member of a calk embodyingthe invention, a portion being broken away;

Figure 2 is an elevational view of the stem member;

Figure 3 is a section on the line 3--3 of Figure 2;

Figure 4 is a section, on a vertical plane, of the two members in theprocess of being assembled;

Figure 5 is a section similar to Figure 4 but after the assembling ofthe members has been completed;

Figure 6 is a section on the line 6-6 of Figure 4; and

Figure 7 is a section on the line 77 of Figure 5.

The improved calk consists of a disc 10 which has a central aperture 12,and a stem member 14. The disc is made of a relatively soft metal suchas soft steel and is preferably slightly cupped or dished as shown onthe drawing. Other details such as holes 16 for a wrench may beincluded.

2,722,757 Patented Nov. 8, 1955 The stem member 14 is preferably ofhardened steel and has a frusto conical ground-engaging portion 20 witha gradual taper. At the base of the frustum 20 the member expands to itsmaximum diameter, the portion 22 of maximum diameter being short andserrated with a series of teeth 24 which extend parallel to the axis ofthe member and alternate with grooves 26 which are open at both ends.The serrated portion 22 (Figure 2) terminates at its upper end in anannular surface 28 which with the adjoining flaring portion 30 of themember forms a deep circumferential V-groove 32. The member then tapers,as at 34 to a screw-threaded portion 36 adapted to screw into a threadedsocket (not shown) mounted in the sole of a shoe. The flaring portion 30and tapering portion 34 form a circumferential rib 37 which has adiameter substantially equal to the root diameter of the serratedportion 22, that is, the diametrical distance between mutually oppositegrooves 26 in the serrated portion.

The aperture 12 of the disc 10 has a diameter substantially equal to theroot diameter of the serrated portion 22 of the stem member 14 andtherefore substantially equal to the diameter of the rib 37. When a discis placed on a stern member 14 as indicated in Figure 4, the taperingsurface 34 guides it to a position in which it is accurately centeredwith respect to the axis of the member 14 when it meets the serrationsof the portion 22. When the disc is forced down to the position shown inFigure 5, the hard teeth 24 push up through the lower portion of thedisc and displace upwardly the corresponding small portions of the upperportion of the disc adjacent to said central aperture. The die (notshown) which presses the disc down is so shaped as to force the upperportion of the disc adjacent to the central aperture into tightengagement with the stem member 14 in the groove 32, thereby locking thedisc securely in the position on the stem member shown in Figure 5 sothat the member cannot be separated from the disc by force exertedthereon in either direction unless such force is of the order of a tonin magnitude.

I claim:

1. A calk for an athletic shoe or the like, comprising a metal dischaving a central aperture, and a stem member of harder material than thedisc extending through said aperture, said stem member having in order afrustoconical ground-engaging portion merging into a short serratedportion which is the portion of greatest diameter, a narrowcircumferential groove, and a screw-threaded stem, the lower portion ofsaid disc being tightly engaged on the upper portion of said serratedportion and having the upper portion of said disc tightly engaged in thesaid groove.

2. A stem member for a golf-shoe calk, said member having aground-engaging portion at one end, a screwthreaded portion at the otherend, and an intermediate portion including a serrated portion of greaterdiameter than the end portions and a circumferential rib between theserrated portion and the threaded portion forming a narrowcircumferential groove just above the serrated portion, said rib havinga diameter substantially equal to the root diameter of the serratedportion.

References Cited in the file of this patent UNITED STATES PATENTS1,948,885 Riddell Feb. 27, 1934 2,098,468 Shapiro Nov. 9, 1937 2,523,652Dowd et al Sept. 26, 1950 2,578,591 Phillips Dec. 11, 1951

